I. B. Vorob’eva
Sochava Institute of Geography, Siberian Branch, Russian Academy of Sciences,
ul. Ulan-Batorskaya 1, Irkutsk, 664033 Russia
e-mail: irene@irigs.irk.ru
Received August 20, 2011
Abstract—As a result of the long-term station-based study of island forest-steppe geosystems in the south of
Middle Siberia, it was revealed that the curve of the root layer temperature (20 cm) is similar to the air temper-
ature curve with a one-month shift, which occurs due to the inertial properties of soil. The yearly mean air tem-
perature has been consistently negative in recent years. The dynamics of organic matter is indicative of the
hydrothermal state of geosystems. The revealed temporal changes in mobile organic matter reflect the dynamic
state of forest-steppe geosystems, as well as the soil climate (temperature and moisture deposits) on slopes with
different exposures. The general changes detected for a period longer than 20 years manifested in a significant
increase in the total carbon content in soils, humic acids, and insoluble residue.
Keywords: dynamics, temperature, precipitation, soil climate, organic matter
DOI: 10.1134/S2079096113020091
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